Precision Metering Needle for 21M/21XM Carburettors OS22082350 by O.S. Engine  [OS22082350]

O.S. ENGINES METERING NEEDLE 21M 21XZ-R V2,21XM
Price:
AUD$13.03
Brand:
O.S. Engine
Model:
OS22082350
GTIN:
4531028149694
Condition:
Brand New
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Precision needle for 21M/21XM carburettors

The O.S. Engine metering needle is supplied as a replacement part for 21M and 21XM carburettors on nitro RC engines, controlling fuel flow via the needle valve so you can fine tune the air/fuel mix across operating ranges.

A stainless steel tip resists seating wear, while the shaft and taper are produced to match original fit specifications for these carburettor types. Fitting requires removal of the carburettor top and a direct swap; subsequent tuning should be carried out in small steps at the track to establish optimal idle and main settings.

This component is intended when you need to restore consistent mixture control or when tuning calls for a replacement needle. It applies to scale RC engines and not to full-size engines.

Does this needle require a break-in period?

There is no special break-in; however, after installation check settings at idle and under load and make small mixture tweaks while monitoring engine response to ensure consistency.

Will the needle alter main jet requirements?

The needle affects mixture control mid-range and top-end, so you may need to reassess main jet settings during tuning, but changes are usually minor if the needle matches factory dimensions.

What signs indicate the needle needs replacing?

Symptoms include inconsistent idle, spitting on throttle, or poor top-end; if seating wear is visible or tuning becomes unstable, replace the needle.

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